Robert Boschgmbh

Bosch Systemes De Freinage

Other

Jean-Pierre Delage

Jean Fourcade

Philippe Bourlon

François Gaffe

Yannick Nen

Philippe Come

Omar Brahmi

Emmanuel Fraisse

Jean-Louis Penigault

Nathalie Beccafico

Stéphane Manfredini

When an element of the electro-hydraulic brake circuit () is malfunctioning, a master cylinder () can brake the vehicle. A brake actuation simulator () is then disconnected from the master cylinder () by means of an O-ring gasket () after the gasket has been compressed between a groove () in a secondary piston () and a bore () in the master cylinder. In order to prevent the gasket from being extruded from the groove during brake release (or brake pedal release) resulting from sudden braking, the invention makes provision for a pressure relief duct () to be provided inside the secondary piston. Extra pressure can then be discharged during brake release (or brake pedal release) through the brake release duct () from the inside of the chamber () of the simulator towards the primary chamber () of the master cylinder.

Electro-hydraulic brake circuit for a vehicle

A tank intended for an electrohydraulic braking system comprises, according to the present invention, a first chamber () for the supply of a primary hydraulic circuit of a master cylinder with brake fluid, a second chamber () for the supply of a secondary hydraulic circuit of the master cylinder (not shown) with brake fluid, a third chamber () for the supply of a hydraulic pump with brake fluid, and a fourth chamber (), a measuring one, which accommodates a detection device, indicating when the brake-fluid level inside the tank is too low. The tank has a flow path for the interconnection of the first chamber (), the second chamber () and the third chamber () when the hydraulic-fluid level is higher than a safety level, and for the fluid-tight separation of said chambers when the hydraulic-fluid level is lower than the safety level.

Compact tank for an electrohydraulic braking system

This master cylinder comprises a body () defining a primary pressure chamber () and a secondary pressure chamber (), separated by an axially movable piston (), the so-called secondary piston; means () for the hydraulic connection of the primary pressure chamber () with braking-force simulation means (); and complementary moving and stationary means () for the sealing of the hydraulic connection means (). The moving and stationary sealing means () are borne by the secondary piston () and the body () respectively. The secondary piston () is axially movable between a rest position, in which the complementary sealing means () are spaced apart from each other, and a position in which said complementary sealing means () are cooperating with each other. The secondary piston () comprises two portions (P,D), capable of an axial motion in relation to each other in order to adjust the relative axial position of the moving and stationary sealing means () when the secondary piston () is in its rest position.

Tandem master cylinder for electrohydraulic braking systems

Hydraulic capacity with controlled pressure absorption

Growing community of inventors

Saint Mande, France

Jean-Pierre Delage